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A134372 a(n) = ((2n)!)^2. 7
1, 4, 576, 518400, 1625702400, 13168189440000, 229442532802560000, 7600054456551997440000, 437763136697395052544000000, 40990389067797283140009984000000, 5919012181389927685417441689600000000 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
FORMULA
From Amiram Eldar, Nov 16 2020: (Start)
Sum_{n>=0} 1/a(n) = A334379.
Sum_{n>=0} (-1)^n/a(n) = A334632. (End)
MATHEMATICA
Table[((2n)!)^(2), {n, 0, 10}]
((2*Range[0, 20])!)^2 (* Harvey P. Dale, Jul 14 2011 *)
PROG
(PARI) a(n) = ((2*n)!)^2; \\ Michel Marcus, Nov 16 2020
CROSSREFS
Sequence in context: A274470 A282196 A114764 * A177926 A241095 A343474
KEYWORD
nonn
AUTHOR
Artur Jasinski, Oct 22 2007
STATUS
approved

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Last modified June 23 10:38 EDT 2024. Contains 373643 sequences. (Running on oeis4.)